EP0191685B1 - Dispositif électromagnétique de commande de barre de contrôle, à pertes thermiques réduites - Google Patents

Dispositif électromagnétique de commande de barre de contrôle, à pertes thermiques réduites Download PDF

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Publication number
EP0191685B1
EP0191685B1 EP86400185A EP86400185A EP0191685B1 EP 0191685 B1 EP0191685 B1 EP 0191685B1 EP 86400185 A EP86400185 A EP 86400185A EP 86400185 A EP86400185 A EP 86400185A EP 0191685 B1 EP0191685 B1 EP 0191685B1
Authority
EP
European Patent Office
Prior art keywords
movable
pole
coil
casing
energization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86400185A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0191685A1 (fr
Inventor
Fernand Savary
Guy Le Saulnier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Areva NP SAS
Original Assignee
Framatome SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Priority to AT86400185T priority Critical patent/ATE43022T1/de
Publication of EP0191685A1 publication Critical patent/EP0191685A1/fr
Application granted granted Critical
Publication of EP0191685B1 publication Critical patent/EP0191685B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
    • G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
    • G21C7/12—Means for moving control elements to desired position
    • G21C7/14—Mechanical drive arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to an electromagnetic device for linear displacement of a nuclear reactor control rod.
  • nuclear reactor of the type comprising a sealed envelope projecting from the cover of the reactor vessel, in which are displaced longitudinally a first and a second set of means for gripping the rod, offset in the longitudinal direction, the first set of means being associated with a movable pole cooperating with a coil, called a holding coil, carried by the envelope and movable by excitation and cutting of the coil between a position where the first set of means grasps the rod and a position where it releases it.
  • nuclear reactor of the type comprising a sealed envelope projecting from the cover of the reactor vessel, in which are displaced longitudinally a first and a second set of means for gripping the rod, offset in the longitudinal direction, the first set of means being associated with a movable pole cooperating with a coil, called a holding coil, carried by the envelope and movable by excitation and cutting of the coil between a position where the first set of means grasps the rod and a position where it releases it.
  • one of these positions being defined by pressing on a fixed pole
  • the second set of means being associated with a movable plunger cooperating with a coil, known as a transfer coil, and displaceable, by excitation and cutting of this e coil, between a support position on another movable pole, position in which the set of means grasps the rod, and a position where it releases it, said other movable pole cooperating with a coil, called a lift, making it possible to move said other pole movable between two positions spaced apart by a determined pitch.
  • the known devices of the type defined above function satisfactorily.
  • the actuation of the various coils in a suitable sequence makes it possible to move step by step, in one direction or the other, the rod and therefore the control bar.
  • the rod By supplying only the holding coil, the rod is retained in a well-defined position.
  • the rod In the event of a supply failure of all of the coils, the rod is released and, in the usual case where the bar is placed above the reactor, its weight brings it to the position of maximum insertion into the core , which causes, in the event of a power failure of the devices of all the bars, an emergency stop.
  • the invention aims to significantly reduce the heat losses of electromagnetic linear displacement devices, and in particular of devices of the above-defined type.
  • thermosiphon A main thermosiphon is established, the circulation of which is done according to the arrows f0, f1, f2 and f3 and a secondary thermosiphon which goes up to the upper part of the envelope 10, along the path f0, f4, f5, f2, f3.
  • the main thermosiphon constitutes a loop which bypasses all of the gripping means, contained in frame 19, which is generally designated by the term "pawl box" when the gripping means comprise pawls cooperating with grooves of the rod 20, which is the most frequent case.
  • the pawl box has, at an intermediate level, a breach, shown at 21, formed by the grooves necessary for the passage of the pawls. But this breach does not contribute appreciably to the formation of a thermosiphon.
  • thermosyphon is only cut off when the movable pole associated with the first set of means is in the rod holding position.
  • this limitation is without disadvantage, since the mode of use of the mechanisms is such that this situation is that which arises for approximately 98% of the operating time of the reactor.
  • FIG 2 shows the circulation diagram which is then obtained, when the first set of gripping means is in the holding position and closes, at 23, the return branch (cold branch) of the thermosiphons.
  • the loops of the thermosiphons can only be closed by the constricted passages 21 which constitute the openings of the transfer pawls.
  • the movable pole cooperating with the retaining coil will generally constitute a movable valve for closing conduits formed in a fixed pole cooperating with it, the movable pole coming to bear against the fixed pole when the retaining coil is supplied .
  • the total section offered by the conduits is at least equivalent to the passage section offered to the liquid by an annular clearance between the casing and the fixed pole in known devices. It is also desirable to reduce the particular pressure losses due in particular to sudden variations in orientation and section of the flow path.
  • the device shown in Figure 3 is intended to operate a nuclear reactor control bar cooled and moderated with pressurized water. Its general constitution will only be described briefly, since it is already known.
  • the device comprises a sealed outer casing 10 on which is fixed a magnetic carcass 12 delimiting with the casing the annular housings for receiving the three coils 14, 16 and 18, (lifting coil, transfer coil and holding coil).
  • the rod 20 to be moved is mounted in the axis of a channel formed by the casing 10. This rod has regularly distributed grooves for gripping the rod by the second means and the first means mentioned above, which will be described successively.
  • the second means comprise a fixed annular pole 22 which cooperates with the carcass 12 and two magnetic rings 24 and 26 secured to the casing 10 to form the fixed part of a magnetic circuit, the movable part of which is constituted by a lifting pole 28.
  • This pole is secured, for example by a threaded connection 30, to a sleeve 32 slidably mounted on a jacket 34 whose upper end is secured to the fixed pole 22.
  • the sleeve 32 also carries a transfer pole 36.
  • a spring of booster 38 compressed between the fixed pole 22 and the mobile lifting pole 28 tends to push the mobile assembly comprising the poles 28 and 36 and the sheath 32 towards the bottom stop position in which it is shown in Figure 3.
  • This position stop is defined by the support of the lower edge of the sheath 32 against a fixed annular pole 46 whose role will appear later.
  • the excitation of the coil 14 creates a magnetic field which tends to lift the movable pole 28 to bring it to bear against the fixed pole 22.
  • transfer pawls 40 are regularly distributed around the rod 20 and each rotate on an axis 42 integral with the sheath 32. Each of the pawls 40 is movable between a rest position where it is shown in FIG. 3 and a working position where it is engaged in the grooves of the rod 20.
  • the mechanism for operating the pawls comprises a plunger 46 made of magnetic material mounted with gentle friction on the sheath 32 and connecting rods 44 articulated, on the one hand, on the pawls , on the other hand, on the plunger 46.
  • a return spring 48 compressed between the transfer pole 36 and the plunger 46 tends to maintain the latter in the rest position where it is shown in Figure 3, for which the pawls 40 are released from the stem.
  • the transfer coil 16 is placed so that, when energized, it creates a magnetic field in a circuit comprising the carcass 12, the magnetic ring 26, the transfer pole 36, the plunger 46 and another magnetic ring 50 and brings the plunger 46 into abutment against the transfer pole 36.
  • the first means, cooperating with the holding coil 18, also have a conventional general constitution. These means are shown in Figure 3 in the position they occupy when the coil 18 is energized. They include a movable pole 62 in two parts assembled by thread and stopped by a spindle 64. The return spring 66, acting at against the attraction of the coil 18, is housed in a recess of the pole 62. A non-magnetic ring 68 is advantageously interposed between the spring 66 and the fixed pole 45. This ring, the part of which separates the poles 62 and 46 can be very thin, avoids the risk of sticking by remanent magnetism. Holding pawls 70 are mounted in a similar manner to that of the pawls 40, so as to be controlled by the movable pole 62.
  • the movable pole 62 and the fixed pole 45 of the first means constitute a valve, closed when the retaining coil is supplied, open when the coil is de-energized and the movable pole is separated from the fixed pole.
  • This valve is placed on the descending branch or cold branch of the water circulation path by thermosiphon effect, so as to interrupt the thermosiphon.
  • the fixed pole 45 does not allow any clearance of circulation of water between it and the casing 10.
  • several conduits 72 parallel to the axis of the rod are formed in the fixed pole 45. The total section of water passage offered by these conduits is sufficient so that the pressure drop they cause to the water passing through them when the bar falls remains acceptable.
  • the envelope 10 of which has an internal diameter of 133 mm sixteen holes of 11 mm in diameter can be provided.
  • conduits 72 reduces the section of ferromagnetic material offered to the magnetic field force lines created by the coil 18. It is desirable to reduce in return the diameter of the recess of the return spring 66 which also ensures the maintenance of the ring 68 against the fixed pole 45, in order to restore a sufficient value to the section of ferromagnetic material.
  • the ring 68 in which holes are drilled extending the conduits 72, constitutes the seat of a valve whose movable member is formed by the movable pole 62 whose external diameter is sufficient for it to cover the holes made in the ring 68 and closes them when it is glued against the fixed pole 45 by the attraction of the coil 18.
  • a clearance 74 remains between this movable pole and the casing 10 and constitutes a path for the passage of water during the fall from the bar, as we will see later.
  • the devices whose movable pole and / or fixed pole of the holding electromagnet themselves constitute an element constituting a cut-off valve are not the only ones capable of fulfilling this cut-off function of the cold branch of the main loop of the thermosiphon.
  • Drawer devices such as that shown diagrammatically in FIGS. 4A and 4B (where the members corresponding to those in FIG. 3 are designated by the same reference numbers) can also fulfill this role.
  • the mobile pole 62 then plays the role of drawer.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Valve Device For Special Equipments (AREA)
  • Electromagnets (AREA)
  • Magnetically Actuated Valves (AREA)
  • Braking Arrangements (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Vehicle Body Suspensions (AREA)
  • Control Of Linear Motors (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
EP86400185A 1985-01-29 1986-01-29 Dispositif électromagnétique de commande de barre de contrôle, à pertes thermiques réduites Expired EP0191685B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86400185T ATE43022T1 (de) 1985-01-29 1986-01-29 Elektromagnetischer regelstabantrieb mit verhinderten thermischen verlusten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8501216A FR2576706B1 (fr) 1985-01-29 1985-01-29 Dispositif electromagnetique de commande de barre de controle, a pertes thermiques reduites
FR8501216 1985-01-29

Publications (2)

Publication Number Publication Date
EP0191685A1 EP0191685A1 (fr) 1986-08-20
EP0191685B1 true EP0191685B1 (fr) 1989-05-10

Family

ID=9315718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400185A Expired EP0191685B1 (fr) 1985-01-29 1986-01-29 Dispositif électromagnétique de commande de barre de contrôle, à pertes thermiques réduites

Country Status (11)

Country Link
US (1) US4696783A (es)
EP (1) EP0191685B1 (es)
JP (1) JPH0640145B2 (es)
KR (1) KR940002702B1 (es)
AT (1) ATE43022T1 (es)
CA (1) CA1253637A (es)
DE (1) DE3663315D1 (es)
ES (1) ES8704025A1 (es)
FR (1) FR2576706B1 (es)
YU (1) YU12086A (es)
ZA (1) ZA86389B (es)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2600812B1 (fr) * 1986-06-27 1990-06-01 Framatome Sa Dispositif d'entrainement de barre de commande de reacteur nucleaire, a clapet mobile
US5232656A (en) * 1992-02-25 1993-08-03 The United States Of America As Represented By The Department Of Energy Fast-acting nuclear reactor control device
US5307384A (en) * 1992-12-16 1994-04-26 Westinghouse Electric Corp. Segmented coil assembly for control rod drive
FR2774141B1 (fr) * 1998-01-28 2000-04-07 Jeumont Ind Dispositif de blocage en rotation de deux pieces coaxiales vissees l'une sur l'autre, notamment les deux pieces d'un plongeur de cliquet de maintien d'un mecanisme de deplacement de barre de commande
KR101086056B1 (ko) * 2010-02-01 2011-11-22 한국전력기술 주식회사 경수로용 제어봉 구동장치의 냉각 유니트
US10032529B2 (en) 2010-12-09 2018-07-24 Westinghouse Electric Company Llc Nuclear reactor internal electric control rod drive mechanism assembly
US9985488B2 (en) 2011-07-22 2018-05-29 RWXT Nuclear Operations Group, Inc. Environmentally robust electromagnets and electric motors employing same for use in nuclear reactors

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1371802A (fr) * 1962-04-30 1964-09-11 Westinghouse Electric Corp Appareil à mouvement linéaire
DE1222175B (de) * 1964-06-02 1966-08-04 Siemens Ag Verfahren und Einrichtung zur Beeinflussung, insbesondere Linearisierung der Wirkungskennlinie von Absorberstaeben fuer Kernreaktoren
US3486095A (en) * 1965-05-06 1969-12-23 Westinghouse Electric Corp Cycle control for linear motion device
US3449603A (en) * 1967-09-01 1969-06-10 Westinghouse Electric Corp Two-coil linear motion device
SE334686B (es) * 1970-06-18 1971-05-03 Asea Atom Ab
BE753529A (en) * 1970-07-16 1971-01-18 Acec Positioning device for control rods nuclear - reactor
US3959071A (en) * 1974-05-28 1976-05-25 Combustion Engineering, Inc. Method and apparatus for a nuclear reactor for increasing reliability to scram control elements
US4423002A (en) * 1979-12-19 1983-12-27 Framatome Apparatus for controlling a nuclear reactor by vertical displacement of a unit absorbing neutrons
FR2475782B1 (fr) * 1980-02-12 1986-11-28 Framatome Sa Perfectionnement aux dispositifs de commande des barres de reglage d'un reacteur nucleaire

Also Published As

Publication number Publication date
DE3663315D1 (en) 1989-06-15
ES8704025A1 (es) 1987-03-01
ZA86389B (en) 1986-10-29
ES551316A0 (es) 1987-03-01
EP0191685A1 (fr) 1986-08-20
KR940002702B1 (ko) 1994-03-30
FR2576706B1 (fr) 1987-04-17
CA1253637A (en) 1989-05-02
KR860006111A (ko) 1986-08-18
YU12086A (en) 1990-12-31
ATE43022T1 (de) 1989-05-15
US4696783A (en) 1987-09-29
JPS61176885A (ja) 1986-08-08
JPH0640145B2 (ja) 1994-05-25
FR2576706A1 (fr) 1986-08-01

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